Chem 9
Which species is a diprotic acid
H2CO3
Which species is the conjugate acid of HCO3-?
H2CO3
Which salt forms a solution with a pH < 7 when dissolved in water?
(NH4)2SO4
What is the net ionic equation for the acid-base reaction of hydrobromic acid with sodium hydroxide?
-OH(aq) + H+(aq) → H2O(l)
Which buffer solution has the lowest pH (HF has Ka = 7.2 × 10-4)?
0.20 M HF and 0.10 M NaF
What is the molarity of an HCl solution if 43.6 mL of a 0.125 M KOH solution are needed to titrate a 25.0 mL sample of the acid according to the equation below? KOH(aq) + HCl(aq) → H2O(l) + KCl(aq)
0.218 M HCl
What is the molarity of an HNO3 solution if 24.1 mL of a 0.250 M Ba(OH)2 solution are needed to titrate a 15.0 mL sample of the acid according to the equation below? Ba(OH)2(aq) + 2 HNO3(aq) 2 H2O(l) + Ba(NO3)2(aq)
0.803 M HNO3
Which solution has the highest pH?
1.0 × 10-7 M -OH
The pH of a lime is 1.90. What is the [H3O+]?
1.3 × 10-2 M H3O+
Which solution has the lowest pH?
1.3 × 10-8 M -OH
The [-OH] in a sample of egg whites is 6.3 × 10-7 M. What is the [H3O+] in these egg whites?
1.6 × 10-8 M H3O+
The [H3O+] in a cabernet sauvignon wine is 5.9 × 10-4 M. What is the [-OH] in this wine?
1.7 × 10-11 M -OH
Which solution has the highest pH?
1.9 × 10-8 M H3O+
What is the pH of a peach with a [-OH] = 3.2 × 10-11 M?
3.51
How many milliliters of 0.653 M NaOH are needed to neutralize 25.0 mL of a 1.02 M HBr solution? The neutralization reaction is: NaOH(aq) + HBr(aq) → H2O(l) + NaBr(aq)
39.1 mL NaOH
What is the pH of a buffer that contains 0.15 M CH3COOH and 0.10 M NaCH3COO (Ka = 1.8 × 10-5)?
4.57
What is the pH of a cleaning solution with a [H3O+] = 7.4 × 10-9 M H3O+?
8.13
Which term correctly describes the medical condition in which the pH of blood is greater than 7.45, and therefore the blood is more basic than normal?
Alkalosis
Which compound is a weak acid?
CH3COOH
Which solution containing an equal number of moles of each of the substances is a buffer?
CH3COOH and NaCH3COO
Which species is the conjugate base of HCN?
CN-
What are the products of the acid-base reaction of sodium carbonate with acetic acid?
CO2(g) + H2O(l) + 2 NaCH3COO(aq)
Correctly identify the missing product in the following acid-base reaction: NH3 + HCl NH4+ + ________
Cl-
Which ion is the strongest base?
F-
Which species is the conjugate acid of HPO42-?
H2PO4-
Which species is the conjugate acid of HS-?
H2S
Which species is the conjugate base of HPO42-?
H2po4-
Which of the following is the hydronium ion?
H3O+
Correctly identify the conjugate acid-base pairs in the following equation: HC2H3O2(l) + H2O(l) H3O+(aq) + C2H3O2-(aq)
HC2H3O2/ C2H3O2-and H2O/ H3O+
Which species can act as a Brønsted-Lowry acid?
HCl
In the acid-base reaction: F-(aq) + HNO3(aq) HF(aq) + NO3-(aq) ________.
HNO3 is the acid and its conjugate base is NO3-(aq), and F- is the base and its conjugate acid is HF
Which acid has the strongest conjugate base?
Hydrocyanic acid HCN (Ka = 4.9 × 10-10)
Which acid is the weakest?
Hydrocyanic acid HCN (Ka = 4.9 × 10-10)
Which acid is the strongest?
Hydrogen sulfate ion HSO4- (Ka = 1.2 × 10-2)
Which species can act as an Arrhenius base?
LiOH
What is the balanced equation for the acid-base reaction of nitrous acid with lithium hydroxide?
LiOH(aq) + HNO2(aq) H2O(l) + LiNO2(aq)
Which species is the conjugate base of NH3?
NH2-
Which species can act as a Brønsted-Lowry base?
NO3-
Which salt forms a basic solution when dissolved in water?
Na3PO4
What is the correct name of HNO2?
Nitrous acid
What is the correct name of H2SO4?
Sulfuric acid
An Arrhenius acid is
a compound that contains a hydrogen atom and dissolves in water to form a hydrogen ion, H+
An Arrhenius base is
a compound that contains hydroxide and dissolves in water to form OH-
Which pH value indicates the higher concentration of OH-?
pH = 11.4
Which pH value indicates the higher concentration of H3O+?
pH = 5.2
A Brønsted-Lowry base is
proton acceptor
A Brønsted-Lowry acid is
proton donor
In the acid-base reaction: HCN(aq) + F-(aq) CN-(aq) + HF(aq), where Ka (HCN) = 4.9 × 10-10 and Ka (HF) = 7.2 × 10-4, the ________.
reactants are favored
Ammonia, NH3, is an example of a ________.
weak base
